Can someone help me ID this part?

Hi, I am having a minor problem trying to locate a part number for my 1999 G20t and replace it. The part is the plastic piece that is just behind the front bumper. I think the purpose is to prevent debris from getting up to the engine while driving. In the maintenance manual, the part is identified on page BT-6. I have attached a picture of what I am talking about. I could probably get by with just the fasteners that are supposed to hold it in place (part # MBT080A?, page BT-3). I think this came dislodged by parking too far over a curb in a parking space. Any help would greatly be appreciated. I'm pretty sure the parts are inexpensive, I just need to know part numbers so I can order.
Thanks!!!
http://i37.photobucket.com/albums/e86/sc2az95/G20/g20part1.jpg
http://i37.photobucket.com/albums/e86/sc2az95/G20/P8240002.jpg
http://i37.photobucket.com/albums/e86/sc2az95/G20/g20part2.jpg

that part is the under tray, dirt shield. commonly called shit shield. take the info you have to the dealer they will know what you mean. if you leave it off it will have no effect on the car.